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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a86f25136ce0d96c4c8deef63d939b9d9ca3c906dfe264abbca1ba3d4485c5' 
  AND token = 'HDy/f7/bXJoRcddLnxdsZF9nVGGXLhG3DsA/OYi87cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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