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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9051359e2bfcc011817db7f1179c7c0c16aad9c95d9af219b743302c74c0028' 
  AND token = '9hjKQ5I4tN/r82fAGp1RQ/1iJTFKPmle9ryOvi7qLfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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