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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7ebff7e6a1cb1841a8b52098b3ef26db07dc71b3fe2172313219f1391fb2e7' 
  AND token = 'Y+x3dme3tXePcejxsyQFGto5nMohWqEJvwU1MKOZM5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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