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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e30062947e9f3a0d321739df89b2b0622b0d3f370b85cb9f3f8b45cc470e65' 
  AND token = 'Q5TjUJy346SdSxdyDoRL5Lwarnce6FEADqXDsuvsa7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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