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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472f956af925d53d37cdf7850767a55896d1786f925118fcf68d76e66a1ffb14' 
  AND token = 'uO6A/jbCZqR7bNkS3Skqv77fL074ZzzDGk648qk00F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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