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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87562ed27323c68d5f53b2de2ea768b52d4313469e212ede88158c96dae2f66a' 
  AND token = 'blrIZGf5qWSUJOcbPbBulFp3tYDgz31105urrbsMkmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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