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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fd07ac7c558c2d5811b690722831a6ea192077adae2eb9b35f8a6c34646afc' 
  AND token = 'm37SU0+nVbkCPt1bvONBg+gOmAd4REMMGx3M+h6JW9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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