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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d1e16a2d3f896afb1e13c48deb19b0fadb0ad80d5bfa5a0ecff38b18131417' 
  AND token = 's2t//YfHumyazDGEvr5z5wtQqjKjburLtsqDv5EYPVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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