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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96735549e02330ce457246c44be1c4f85f40183c514cae1e4045b6541c352767' 
  AND token = 'iNMjZMRp4nmi+MsIkrwH7QY2gK08vBuQkJOus3Ccc34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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