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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178b61c21b6e5f90a9d667120542733c9c840da06d4e6ca9207e9dd706abf3aa' 
  AND token = 'CfYCJJ/VXK/xarKSgarKTSodOHgukWB1mQGF2a2UqVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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