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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d30afca7ddd6a16e80f102a7cecd5e6b584e502f9e185cc822a5f15c2a7f9c' 
  AND token = 'j5vXEQQ3FV8OTIqOfNnGahunoBW4FV/7Huy/cb4WA0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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