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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb0918b2face83fb5253bc52b959a9606033aa25e6e42c823471173621bf899' 
  AND token = 'Z3eTZFUQY0cHj4C3S3Hsd38HgtfmoxTeA5wwuo3NSGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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