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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa2ef115f4e23355dc0eaeca138cb4ad2f1fcc13d8913833b4fa8e866751e59' 
  AND token = 'hRA8wakER/mLU/TCC9kYmVueh2xxsjdyfud5D6UsH0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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