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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0330c0905612e62d3173583d413edc936032619c91bf7b14ec19e83dbd8c30f7' 
  AND token = 'GmIxZNnwL6JVP/w+aAgkJir/d4GFPM/nlfUGSPRk2HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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