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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70ce8f9c24f029d73197fef9406a6d39c62089ebba538c47304bb0822b1888f' 
  AND token = 'WcQWeNeye3m9ccje+puqdPD/+NliGlXvYMLvdEebOFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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