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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06173ce4b26c1203181965ccd9c77d0deb3d1ea4964e2be4e510381b53d6b4b3' 
  AND token = 'vfJrrq23FKzYqT7kvEUjQgo2Ko5tHLjPV5dYHTK4zXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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