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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c86b23e4ac2477e8cf5709c1ed665cdddf57d3af91b3c539b3f03fef81377b' 
  AND token = 'kUSsqL9RKKTvWMo1oRfyel3R8IgLVgeFIdeH0C2DSmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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