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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85e4b38f639d63facc7bea63c2b29cfd925919614358c867146ee0a9e9dcce9' 
  AND token = 'DcpaF/7y+PdTr7kimim9zSYEgUDIH5e1bzS7bmkna5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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