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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdb476c6df8b7cd52c70545906d9e968c657436baf2c663bbc47eec52ae9229' 
  AND token = 'LZkJ9+7hfzh3EOZF4PJ8gRTqJ3aymMT1ioudawShvho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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