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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7b4ac601bc6b1061e125b86e7ed1685d6d3e954ffbc49512fee5faa392e7fa' 
  AND token = 'otcM2UG+AClhKMya3TD/I+6HRW9JAVAkBfJkv2rjxk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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