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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a934c4e78dcad94aa0f4cf81c5f4e1e5c5444c03378e6858688444463feb2ed8' 
  AND token = 'SUSVnWHpsgloZl9iSuyoV6UcFrV2xbeHNTLuhZWYefk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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