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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f73b803fa56be6f9a3c2a0e503bc19f6b557e798e7d3582c5db554a74c802e' 
  AND token = '/aXCSdq8IRMYWZA2u5GjsGoU/y4hVEdsAu6/KA1CnVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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