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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ced619689f86d3a2039cb75e6092afcfc3724093a0f6e00cbfde6e4a1d86243' 
  AND token = '+Lh3SBrkdUHJ6Oy86F6N31ATolzaN2DY83VfvAafp+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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