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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aebd1b319f824e2e74bd09bf843c253c58d28ce6592e1bb0a3128c6309c3085' 
  AND token = '4o2PDeaizMy3VAEJTqUC+H6N3OXchaK3eSQC5LYP1iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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