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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c3c1432c175d751a29f6d3261594ce6382eacd0fd4372a80c064ff8c300f0' 
  AND token = '0yIypTaiv1Ic7hCTiygTxOLhhaQSbFYVi6VpKMA7Pc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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