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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f70b469d135e2ad150ec86bd046cc34b212ceef5d36bb8809c6627848bea86c' 
  AND token = '6oEMvHSBmQO7E1fB7+FsWlkV1bg2KYiOlcxPENDuxBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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