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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd933cccd5e20b472942bc5d0f66c2e410860912a1c2079e477c003cf61060c3e' 
  AND token = 'T7k2F5mj842jvENtDCrap4LGUQKH4CNUjat/2ggTQ8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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