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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be8b4a8073c39fac9392e369ece16b011beac6944d968a1edb8a75b0d651c1a' 
  AND token = 'GGL3iWgBym65I5x1xOMaJU/C+WTEyHRSRIwkjVOEabU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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