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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87695487adb99f45238303d3a8a7f40140b2c73e8a9ee50c286c7a70b249f7e6' 
  AND token = 'OBkywPlfsGyuhJACJ0LuUepKQfiLE8CmtYXl6Z4lSc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}