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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e99d304cf05d3603e2d0cc8f4938cefbef01b91ed64519578922e7af7b7d3d' 
  AND token = 'WgOmzrW1mJaoBaNpCTBth19z1GUGE009Dc0AWkzyuOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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