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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f15418d337073408ed3759863a2ee78208ee7f0d4f7a3ecbae15169ccd5a2c' 
  AND token = 'zmjdP38eqDe0bSx8JcB4fwfwLMwCp3SGjzEx3EpAe4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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