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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030267b89df5416aa3601bdc7ceb19f1793daf640d243c2f4c8c351715c22e96' 
  AND token = 'B/Au+MCH2DInBPCN2AmM6cN/eh2w5w1TaB9oMWnw450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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