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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdc6859f9bc497c5a12f6c256866d94649ff88c77bff43dbb0e160be068e90a' 
  AND token = 'Ai+4bDir1X6nXqC6z1XgjZsMg9Pj7haXDDyqDisVEFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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