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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c7a16b90b6af695196c0fb5502c762d1759d7d4782c8573a8c4c9f94e57a67' 
  AND token = 'oycNRRR2ECxfHYfAIdrXrrnc7oJ1I6X8c3OhJYAlEPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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