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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3876f84cf56f321b3dea8233d30e6c82b2782a0b4acebb7f8b2000c809ad419' 
  AND token = 'KvkwNZtJR9VGNZAkIRpxvY80XP/uT29jDuign1a5fMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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