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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdc61e7d11f99c6d73aac0037eac0b08c3ba36759bd4171c265fc4564f33a3e' 
  AND token = 'lcLXOMijjqzduNUGyI8Bw1L371Wkqb/F+gHNWL38msU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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