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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d0410ff22dacb030e8e390d8ee61ea4e01285418eb2d155cf5a34d1aa5d295' 
  AND token = 'DzyBoxNTgI8mr5hp3C8llD6drYVt/YBO1jxWEtlp/u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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