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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fff7e6ca9d0401e60fcd76567f1f70fdddf39bc4933a0c10afdd6b09c5faf1' 
  AND token = 'FdX4+r4EgmF0lFP4WfyA5y+yTbxw+bgmI9sJlv2JFrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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