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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97b6983e6a7287960754d0eefa62f5b0aca94d4900fe83f74b67602b595f6f3' 
  AND token = '+yZ2dneK41VmQL0p3b/rvowKy+M1RcVbQpy+jttxp9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

JSON explain

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