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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f521072ecaed24e8e79d8d764e319b558ec2870443f035604572fb9fa16abad' 
  AND token = 'SGW9/pYO4bGOnNv3/K7wtQNrNjBtabTypjKZbryDPXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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