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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7096c6e9dec811dfee13df648aff3802a4230a4d31e835f8c4148e45f3d6c20a' 
  AND token = 'Hcs9hecZGeqJst6r9rAFFNxO/U9MeUezYe81eUQUX0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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