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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c018bfcd1f827df84905b5df0935850626125d77a11028c8f9cb84871fd2e5' 
  AND token = 'fPTOaIStuHE4ASt0d+peTBGCGLv74CWKcNttpR8XiTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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