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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985564aee8a4f28196bcfcf48ab589067923e626ba16f25805b33bd9fd38850a' 
  AND token = 'DIkDVyBaHHAO6J/IzDnR78ISYZpeCO3I1Sua9cS4eb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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