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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b96a4e0536915f0aa724013607b103969bc3cb9b004bf962dcc5dc66278cea7' 
  AND token = 'NaSnuioKZ4zSZ/LIOYa6uPE3CwnG1k7z4pP9tkM3B5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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