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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46451e619eef0cffc350c23a1df5f668904f2d7d9b72bd644853c044a7afd0b7' 
  AND token = 'A759sG0BxvHg0gqizi8N6LAKbmBp4ycteT3R4kyC+NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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