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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83819af59a2de80cbf0f70dd2a8b56dcfe958ac982a67d0a71a3d85673487950' 
  AND token = 'MMBelUfmC5uIRRNi3Ufsd4ut5zB3k+JaSUCszhpLy+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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