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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53bae47db2caaae03530b956681b3629b0a13d76ae461d99363eca31b6eaeb70' 
  AND token = 'kjdXvVuATT7oZNPau4lo0V0fA/y4IiBeMZ/UeNybCbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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