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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae312db7eb6beb1080eaf684b6758324609f75cacb9d05062eca92dfdee5479' 
  AND token = 'lqf65QuJymQ3mjcKKr7jfwTVrUnacKZB6JbJnpi5NLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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