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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec58c45c778410e188c00e2ca3b296e3108d5fea1467ad810f8a4cc99fe14f9' 
  AND token = 'tzJ9PF5hG/49AbZ1WOTUikOYIBP2iA7eGbiMi8h+xuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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