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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70065b830e92ae96c510536c5ba65ca5518d09f54de5ff5a9b1f6b17467df87b' 
  AND token = 'EnI3x+vXaft05NQlN0ksl6MI6LW/U88UvFdwqD5uJx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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