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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d06c929853e3ce48097df83ec3fcad75b6d113688acac32046de5b4c39146ab' 
  AND token = 'M2rTGKHvsCYXU/mRg8XVBEYislMw2xl1e5lli/fQ1R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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