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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a602328af4299b8044c6f4f4422d8f22076c5c2513979fb102588a1f707429' 
  AND token = '7SdAPXoH+6QcNjQ0AuoLL3mmZYSCjvRBrZrzePRQESM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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