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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b6da352d6b96426e536d83cd015efd71439441b144cf9a3cd992a23102e0e6' 
  AND token = 'AivTs0+XX3n/3ESq2EZDcWGigDefTdKnanXfUuCdZSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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